Instruction manual

Instruction Manual
760006-A
September 2001
Rosemount Analytical Inc. A Division of Emerson Process Management Appendices 11-15
Model NGA 2000 Platform
b. Single Analyzer Analog Autocal I/O
Module
Description
Refer to Section 2-6 to install Single Ana-
lyzer Analog Autocal I/O Module and
Section 2-6e to bind the Single Analyzer
Analog Autocal I/O Module (also known
as the Single Analyzer Analog Autocal I/O
Module).
The standard calibration procedure in the
Analyzer module Menu Structure (under
“Basic controls”) is not automatic. When
you press “ZERO” or “SPAN”, the Ana-
lyzer assumes that you are flowing the
appropriate gas. It does not itself change
any gas flow, nor does it communicate to
the Autocal module described in this or
the next section.
The Single Analyzer Analog Autocal I/O
Module allows the user to either manually
or automatically perform the calibration
procedures for the Analyzer module. The
calibration procedures can be either initi-
ated manually or automatically.
The Single Analyzer Analog Autocal I/O
Module also provides analog signal out-
puts. Up to four span solenoid valves and
one zero solenoid valve (customer sup-
plied) can be energized at set time inter-
vals. The frequency and duration of the
calibration cycle is software programma-
ble, allowing many varied sequences, a
few of which follow:
• zero x times, then span.
• zero, then span.
• zero, span, then check on a midpoint.
• Four SPST and two SPDT relays are
used to drive solenoid valves that con-
trol the flow of zero and span calibration
gases to the Analyzer module. The sev-
enth relay indicates an in-calibration
condition. Relay output definitions:
• Relay 1 - sample bypass: closed when
the sample should not be flowing
through the Analyzer module.
• Relay 2 - zero gas: closed when the
zero gas should be flowing.
• Relay 3 - calibration in progress: closed
when any zero, span or calibration cycle
is being executed.
• Relay 4 - span gas 1: closed when span
gas 1 should be flowing.
• Relay 5 - span gas 2: closed when span
gas 2 should be flowing.
• Relay 6 - span gas 3: closed when span
gas 3 should be flowing
• Relay 7 - span gas 4: closed when span
gas 4 should be flowing
The Auto Calibration Module has six
digital input lines for remotely initiated
calibration. The function of each line:
• Line 1 - do zero calibration
• Line 2 - do span on the selected range
• Line 3 - do a zero and/or span, as pro-
grammed
• Lines 4 & 5 - select the desired range in
binary fashion (for Line 2 above ONLY).
See Table 11-5.
• Line 6 - disables calibration instruction
and allows only a check to occur
RANGE LINE 4 LINE 5
1OFFOFF
2ONOFF
3OFFON
4ONON
Table 11-5. Autocalibration Module – Input Line
Range Control